1. Preheat the oven to 350°F (175°C).
2. Line an 8x8 inch baking pan with parchment paper.
3. In a large mixing bowl, combine oat flour, coconut flour, vanilla protein powder, 1 tablespoon of cinnamon, and 2 tablespoons of sugar.
4. In a separate bowl, mix together almond butter, brown rice syrup, vanilla extract, and almond milk until smooth.
5. Pour the wet ingredients into the bowl with the dry ingredients and mix until a thick dough forms.
6. Transfer the dough into the prepared baking pan and spread it evenly.
7. In a small bowl, mix together the remaining 1 tablespoon of cinnamon and 2 tablespoons of sugar, and sprinkle over the top.
8. Bake for 20-25 minutes, or until the edges are golden brown.
9. Let cool completely in the pan before lifting out and slicing into squares.